Water Quality Update: TTHM Monitoring Results

Last Content Update:

Treatment Plant Improvements

The chart below shows Total Trihalomethanes (TTHMs) measured at the Pumping Station water treatment facility for all samples collected during 2025. Results are displayed to show how TTHM levels changed over time as treatment improvements were implemented.

Earlier in the year, TTHM levels declined following operational adjustments at the treatment plant. A temporary increase occurred during the spring, likely due to heavy rainfall introducing additional organic material into the source water. Subsequent results reflect further decreases associated with system flushing and changes in water movement through the plant.

To continue understanding and improving water quality, the Water Division conducts routine sampling throughout the year. These results help guide ongoing treatment adjustments and system‑wide water quality improvements.

The Maximum Contaminant Level, or MCL, for TTHM is 80 parts per billion (ppb). This is represented by the black control line in the chart.

Total Trihalomethanes (TTHMs) sampling results from the Pumping Station for all samples collected during 2025, shown relative to the EPA Maximum Contaminant Level of 80 parts per billion (ppb).
This chart displays TTHMs (ppb) for Pumping Station samples collected throughout 2025. The horizontal line at 80 ppb represents the EPA MCL. Individual points above the line exceed the standard.
Influent of Contact Tanks
This is the water entering the contact tanks after chlorination and aeration. The purpose of sampling at this point is to assess the quality of water after the initial disinfection step.
Effluent of Filters
This is the water that has passed through the filtration system. The purpose of sampling is to evaluate the effects of disinfection and detention time through the filtration stage.
Plant Tap
This is the final treated water that's ready to be distributed to the public. Sampling here verifies that the finished water meets all regulatory standards for safety and quality before entering the distribution system.

Total Trihalomethanes (TTHMs) Sampling Results – 2025

The below chart shows Total Trihalomethanes (TTHMs) results, measured in parts per billion (ppb), from select sampling locations in Emmett Township, Springfield, and Battle Creek Sites 1 and 2 during 2025. Results are shown in comparison to the MCL of 80 ppb, displayed as a horizontal reference line.

The chart includes the following locations:

  • Emmett Township Site 1
  • Springfield Site 1
  • Battle Creek Site 1
  • Battle Creek Site 2

Only locations with sufficient data collected during the year are included in this chart. Sampling results vary by date and site; the MCL line is provided for comparison.

Viewing individual system results: Use the system labels located above the chart to show or hide each site’s results. Selecting a site name will toggle that site’s data line on or off. You can view multiple sites at once. The MCL (80 ppb) reference line remains visible at all times for comparison.

Total Trihalomethanes (TTHMs) results for Emmett Township Site 1, Springfield Site 1, and Battle Creek Sites 1 and 2, shown relative to the EPA Maximum Contaminant Level of 80 ppb.

Portions of Pennfield – TTHM Sampling Results (2025)

The chart below shows Total Trihalomethanes (TTHMs), measured in parts per billion (ppb), for two monitoring locations that serve portions of Pennfield Township. Results are compared to the EPA MCL of 80 ppb, which appears as a horizontal line. Data status: Site 1 has three sample results; Site 2 has one result so far this year.

View individual site lines: Use the site labels above the chart to show or hide each site’s results. Selecting a site name toggles that site’s data line on or off. You can view both sites together or one at a time. The MCL (80 ppb) line remains visible for comparison.

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Who is Affected?

Only Pennfield Township residents on the following streets are impacted by this issue, as they receive water from the City of Battle Creek:

  • Bellevue Road
  • Cooper Ave
  • 600–740 North Ave
  • Darlene Lane
  • Kimball Ave
  • 69–187 Sharon Ave
  • Mill Road
  • Raymond Road
  • 54 Montford St
  • Wagner Drive
  • Roosevelt Ave
  • 45 Park Ave
  • Toulouse Blvd
  • Hampton Ave
  • Dick Street
  • Hidden Lane
  • Eiffel Drive
  • Charlemagne Blvd
  • Garrison Road
  • LaGrange Ave
  • Brigden Drive
  • Maxwell Ave
  • Burton Street
  • Willison Ave
  • 10–77 VanArmon St
  • Pickford Ave
  1. What is the issue and how did the city become aware of it?
  2. Is this TTHM violation an immediate health emergency?
  3. What caused the recent increase in TTHM levels?
  4. Why did the city increase disinfectant during well-drilling?
  5. How many water customers are impacted by the TTHM exceedance?
  6. How is the City working to reduce TTHM levels and bring the system back into compliance?
  7. What actions has the city taken to notify water customers of the exceedance?
  8. How long will it take for TTHM levels to fall below the threshold?
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